event is another reason. teresa garcia says for the first time first responders are all about what they saw. >> reporter: a horse-drown coach carried the tiny casket of ana marquez-greene. the grieving continues. the police officers who responded to radio calls about a gunman inside sandy hook elementary school described what happened. >> approaching the scene, there were approximately six children that were running from the scene, which added to our knowledge that, yes, this is real. >> reporter: first responders arrived within minutes of the 911 call that came in the morning of december 14. officers say they broke windows to get inside to search for the shooter. >> i heard the gunfire and i went towards it. >> reporter: investigators say the gunman, adam lanza, shot himself when he heard police coming. police chief michael keho says it was a horrific scene when he reached the part of the school where 20 first graders and six adults were shot and killed. >> i was devastated. absolutely devastated. i had no words. >> reporter: he says it was clear no one in the classroom could be s
